Oops, i should better care for sending things to the mailing list address.
-----Original Message----- From: Alexander Stohr Sent: Wednesday, March 27, 2002 22:14 To: 'Leif Delgass' Subject: RE: [Dri-devel] Max texture size No, i dont see problems with that. When the resoultion changes and therefore the memory consumption, all the applications should terminate their screen access, including the OpenGL ones, and then query that maximum values again. bpp and max avail offscreen memory that might apply to your calculations should not change unless modes are switched, so the results are consistent. Let me summarize, the maximum texture level in a multilevel texture mapping is determined by the doulbe square object size of the biggest texture. on linear texture heaps, the plain memory amount makes up the capabilities. (visually on rectangular heaps the biggest texture is left and the smaller levels arrange nestingly on the right half of the buffer) the max level exactly matches the power of 2 that the biggest texture has in dimensions. (assumed that all levels are power of 2 and the smalles is of size 1x1) > -----Original Message----- > From: Leif Delgass [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, March 27, 2002 21:55 > To: Alexander Stohr > Subject: RE: [Dri-devel] Max texture size > > > On Wed, 27 Mar 2002, Alexander Stohr wrote: > > > > So we'd use > > > mach64Screen->cpp for the calculation instead of a fixed 4 > > > bytes/texel? > > > Then the comparison would be: > > > > > > if mach64Screen->texSize[0] >= > > > 2 * mach64Screen->cpp * 1024 * 1024, then MaxTextureLevels = 11 > > > else if mach64Screen->texSize[0] >= > > > 2 * mach64Screen->cpp * 512 * 512 , then MaxTextureLevels = 10 > > > else MaxTextureLevels = 9 (256x256) > > > > > > This should apply to Rage128 and Radeon as well. Am I > > > missing something here? > > > > Yes, if you have a Radeon with i.e. 128 MB then you might want to > > use even bigger textures or higher max levels, as long as the > > renderer can handle them. > > > > Some sort of iteration or loop design might turn out to be the best. > > At least you can specify the lower and upper limits much > easier then. > > > > Regards, AlexS. > > Yes, for Radeon you can go with a larger texture (2048x2048 > looks like the > max from the code, I don't have Radeon specs), I was thinking > in terms of > mach64 which has a max. size of 1024x1024. But do you see any > problem with > the basic idea in terms of using the screen bit depth? Also, > the first > '2' should probably be MaxTextureUnits for cards that have > more than two > texture units implemented, right? > > -- > Leif Delgass > http://www.retinalburn.net > > _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
